In Activity A, you explored photosynthesis in a pond. The dissolved oxygen in a pond is produced by pond plants and algae (small, plant-like organisms) in a process called photosynthesis. At what time of day does photosynthesis take place? Select all that apply. Group of answer choices midnight 4 am 8 am noon 4 pm 8 pm In Activity C, you explored how temperature affects the concentration of dissolved oxygen in a pond. Use the three data points you collected for the cold pond to determine the mean dissolved oxygen of the cold pond. To find the mean, add the three oxygen concentrations and then divide by three. In Activity C, you explored how temperature affects the concentration of dissolved oxygen in a pond. Use the three data points you collected for the hot pond to determine the mean dissolved oxygen of the hot pond. To find the mean, add the three oxygen concentrations and then divide by three.